查询词典 Fresnel diffraction

Field emission scanning electron microscope, X-ray diffraction and poresizer indicate the nanotubes are formed due to the competition of tin monoxide formation and dissolution under the assistance of electric field. The formation mechanism of nanotubes agrees with the theoretic model of oxidation-dissolution.

经场发射扫描电镜、X射线衍射和孔径分析仪分析显示，阳极氧化的前聚体是氧化亚锡，通过在空气中加热转化为二氧化锡，在详细研究制备条件和氧化锡孔道形貌的基础上，提出了氧化锡纳米孔的生成机理符合氧化溶解理论模型。

Mesoporous tin oxide was synthesized by using cetyltrimethyl ammonium bromide or CTAB and Tween-20 as the template or hydrothermal process. Hollow tin dioxide micospheres were synthesized by using resorcinol-formaldehyde gel as the template or hydrothermal process. Thermogravimetric analysis, X-ray diffraction and electron microscopy have been used to characterize the materials.

本文分别采用十六烷基三甲基溴化铵模板法、CTAB和吐温20复合模板法及水热法来合成介孔氧化锡；用间苯二酚和甲醛凝胶模板法及水热法合成空心球氧化锡，并用热分析、X射线衍射、电镜等对以上材料作了形貌及结构表征。

Nano-SnO powders were prepared by sol-gel technique using tin dichloride, oxalic acid and dehydrated alcohol as raw materials, and characterized by thermogravimertric analysis and differential thermal analysis, X-ray diffraction, transmission electron microscope, scanning electron microscopy in combination with various electrochemical methods.

以氯化亚锡、草酸和无水乙醇为原料，采用溶胶－凝胶法制备了纳米SnO粉末，并用热重－差热分析、X-射线衍射分析、透射电镜和扫描电镜等多种电化学方法对其进行了表征。

More than ten years ago,"the negative day" the numerical control line cutting engine bed first applies and the actual production, starts the control bench is uses the transistor separative element assembly to become, after but uses the integrated circuit, now to is using the direction which the microcomputer controls to develop, Therefore this definition design "the electrical fire colored thread cutter automatic control" is by 8031 shrapnel machine took the control core, step-by-steps the electrical machinery achievement to actuate the electrical machinery, the diffraction grating a closed-loop control system which constitutes as the position examination part.

十多年前，&负旦型&数控线切割机床首先应用于实际生产，最早控制台是由晶体管分离元件组装而成，逐渐采用集成电路，现在正向采用微型计算机控制的方向发展，因此本论文设计的&电火花线切割机的电气控制系统&是以89C55单片机作为控制核心，步进电机作为驱动电机，光栅作为位移检测元件而构成的一个闭环控制系统。

After irradiation of Ti-sapphire femtosecond laser followed by a thermo development which is photo-thermo-refractiveprocess,Li2O · Al2O3 · 3SiO2 micro crystalline phase structure is observed and confirmed in the glass matrix with the help of optical microscope and X-ray diffraction.

经近红外飞秒激光照射和热处理后，通过显微镜观察及X射线衍射分析发现，玻璃内部形成以银原子为晶核的Li2O·Al2O3·3SiO2多晶结构微晶，晶体细小，呈乳白色，为六方晶系，呈现空间取向分布结构。

Two coordination polymers [Pb6(H2O)24]·3H2O(1)(H3cit=citric acid)and Pb(H2O)2(2)(tar=tartaric acid)were synthesized under hydrothermal conditions and characterized via IR,TG-DTA,C,H,N elemental analysis,XRD and single crystal X-ray diffraction analysis.

在水热条件下，合成了2个含柔性配体柠檬酸和酒石酸的二价铅配位聚合物[Pb6(H2O)24]。3H2O(1)(H3cit=citricacid)及Pb(H2O)2(2)(tar=tartaricacid)。用红外光谱、差热-热重、元素分析、粉末X射线衍射及单晶X射线衍射等手段对化合物进行了表征。化合物1属三斜晶系，P1空间群，a=0.97053(19)nm，b=0.9764(2)nm，c=1.0955(2)nm，α=109.016(3)°，β=98.380(3)°，γ=92.136(3)°，V=0.9671(3)nm3，Z=2，R1=0.0420，wR2=0.1049，GOF=1.064。

X-ray diffraction Rietveld refinement results indicate that La2Ni1- y Co y O4+δ compositions have an orthorhombic structure with Fmmm space group. The substitution of partial La3+ with Co at the B-site caused an increase in the length of Ni/Co—O1 bond in the ab plane and La/Sr—O2 bond along c axis.

研究结果表明， La2Ni1- y Co y O4+δ具有正交结构， Co离子取代增加了钙钛矿层中 ab 平面上Ni/Co—O键的键长、岩盐层中沿 c 轴方向上La—O键的键长和非化学计量氧含量，并有利于改善材料的烧结性能。

X-ray profile of the resistant starch residue of extruded starch without guar gum showed a V-type pattern of diffraction as indicated by three prominent peaks, however, these peaks reduced in intensities in gum treated sample.

未添加瓜尔豆胶的淀粉挤压产物中的变性淀粉的X射线衍射图谱显示其也具有Ⅴ型结构，这些峰在添加了瓜尔豆胶的样品中下降了。

Through the analysis of the above experimental results, combining the experiments of X-ray diffraction and scanning electron microscope, the author analyzed the acting mechanism of the additives in the stabilization of soil by cement.

通过以上试验结果，结合X射线衍射试验和扫描电子显微镜试验，作者对添加剂在水泥加固土中的作用机理进行了分析。

Particle size analysis by laser diffraction has become a significant analytical tool for sizing up to about 2mm and has made major inroads into sieve analysis methods over the last 10 years.

激光衍射粒度分析对大小高达2毫米的颗粒已成为一个重要的分析工具，并在过去的10年中，在筛分析方法已取得了重大的进展。

Liapunov—Schmidt method is one of the most important method in the bifurcation theory.

Liapunov—Schmidt方法是分叉理论的最重要方法之一。

Be courteous -- even when people are most discourteous to you .

要有礼貌──即使当別人对你最不礼貌的时候。